Frequency-Modulated Circular Accelerator for Variable Beam Energy
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Solution Overview
Problem
The miniaturization of accelerators is hindered by the limited difference in magnetic fields required for beam orbit deviation and aggregation, which is constrained by the saturation magnetic flux density of ferromagnetic materials, making it difficult to achieve both isochronism and beam stability in existing cyclotron and variable energy accelerators.
Innovation Solution
A frequency modulation type variable energy accelerator is designed with a pair of magnets forming a magnetic field, an ion source, and an acceleration electrode, where the radiofrequency electric field frequency is modulated to control the beam orbits, allowing for a miniaturized and variable energy accelerator with a magnetic field distribution that decreases radially, enabling stable betatron oscillations and beam extraction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If a non-uniform magnetic field distribution with Hill and Valley portions is used to ensure beam stability, then beam stability is improved, but the accelerator size cannot be reduced because the magnetic field difference is limited by saturation magnetic flux density
Solution Approach 1:
The invention changes the magnetic field distribution parameter from a non-uniform distribution with Hill and Valley portions to a uniform magnetic field distribution. This parameter change eliminates the need for large magnetic field differences, allowing accelerator miniaturization while maintaining beam stability through a different mechanism (aggregated closed orbits on one side with frequency modulation).
Solution Approach 2:
Instead of creating beam stability through magnetic field non-uniformity (Hill and Valley portions), the invention inverts the approach by using a uniform magnetic field and achieving stability through the aggregation of multiple closed orbits on one side combined with frequency modulation of the radiofrequency electric field.
2Volume of moving object
If the main magnetic field is increased to reduce bending radius for miniaturization, then accelerator size is reduced, but the magnetic field difference required for beam orbit deviation and aggregation becomes unachievable due to saturation magnetic flux density
Solution Approach 1:
The invention changes the magnetic field distribution parameter from non-uniform to uniform, eliminating the need for large magnetic field differences that are constrained by saturation magnetic flux density. This enables both miniaturization and maintained adaptability for beam orbit control.
Solution Approach 2:
The invention replaces the mechanical/magnetic field-based beam orbit control (using magnetic field differences) with a frequency modulation-based control system. The frequency of the radiofrequency electric field is modulated to control beam orbits, substituting magnetic field manipulation with electromagnetic frequency control.
3Volume of moving object
If a uniform magnetic field distribution is used to enable miniaturization, then accelerator size is reduced, but beam stability and isochronism become difficult to maintain
Solution Approach 1:
The invention merges multiple closed orbits of different energies into a single aggregated region on one side. By combining these orbits and applying frequency modulation to the radiofrequency electric field, the system maintains beam stability and isochronism even with a uniform magnetic field distribution, enabling miniaturization.
Solution Approach 2:
The invention introduces dynamic frequency modulation of the radiofrequency electric field to adapt to the aggregated closed orbits. This dynamic control mechanism maintains beam stability and isochronism in the miniaturized accelerator with uniform magnetic field, compensating for the loss of magnetic field-based stability control.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for a miniaturized accelerator capable of varying beam energy extraction, maintaining stability and isochronism while reducing the magnetic field difference, facilitating the miniaturization of the accelerator size.
Implementation Method 1
a pair of magnets which form a magnetic field therebetween
Implementation Method 2
accelerate the beam circulating in a static magnetic field
Implementation Method 3
The frequency of the radiofrequency electric field fed to the ions by the acceleration electrode is modulated by the beam closed orbits
Implementation Method 4
an ion source which injects ions between the magnets
Data Source
AI summary
Provided is a variable energy and miniaturized accelerator. It is impossible to change the energy of the extraction beam in the related cyclotron or to miniaturize an accelerator in the related synchrotron. The accelerator includes a pair of magnets which form a magnetic field therebetween; an ion source which injects ions between the magnets; an acceleration electrode which accelerates the ions; and a beam extraction path which extracts the ions to the outside. A plurality of ring-shaped beam closed orbits formed by the pair of magnets, in which the ions of different energies respectively circulate, are aggregated on one side. The frequency of the radiofrequency electric field fed to the ions by the acceleration electrode is modulated by the beam closed orbits.